This industrial-strength fabric comes from Britain’s oldest

With a zippered fly and metal shank-button waist closure

to make ensure lasting service

One long-time Filson employee recalls his father packing his favorite Jac-Shirt on each and every hiking

You’ll be amazed at how much comfort this slight stretch provides

filson man 400g merino wool half zip fmfel00225420 001 FilsonRuggedTwillBrief This industrial-strength fabric comes fromOur heavyweight 400g Merino Long Sleeve Half Zip is soft and moisture wicking, making it an effective next to skin base layer in frigid conditions that can also double as a light sweater in cooler weather. Constructed from ultrafine heavyweight 400 gram wool, it naturally wicks away sweat and resists odors effectively. Features a short collar and a half zip front to effectively regulate your temperature.